1K source compression npm module
Two source code compressors, for JS1K. Makes self-extracting JavaScript. Both are less than 1KB.
Full of bugs, may or may not work :)
- Version 1 is grammar based compression, (awesome theory), with a greedy binary grammar. The compression is quite bad, as I originally designed for byte, and not utf-8 encoding. Redesigning for utf-8 encoding thus made the grammar very small. It compresses itself from 1226 bytes to 968 bytes.
- Version 2 is semi-lz77. This is more suitable for self-extracting utf-8 encoded JavaScript. It only works for small programs up to ~2K, without unicode characters, and has other bugs. It compresses itself from 2040 bytes to 687 characters = 995 bytes.
Usage example:
$ npm install js1k-compress
[...]
$ node
> compress = require('js1k-compress')
[Function]
> compressed = compress(require('fs').readFileSync('lz.js','utf-8'));
'(f=(i,o,p,c)=>(c=i.charCodeAt(p),c?f(i,o+(c<256?i[p]:o.slice(c&2047,(c&2047)+(c>>11))),++p):o))(`/***᠁、态쀁ꀁ\\n * ᡈえ恈쁈遈1K LZ77 source compression npm module碅See http://js1k-䃱.solsort.ᣱ for descript境...
> console.log(eval(compressed));
/********************************************************************
* *
* *
* 1K LZ77 source compression npm module *
* *
* *
* See http://js1k-compress.solsort.com for description *
* *
* *
* *
********************************************************************/
var compress = input => {
[...]
> require('fs').writeFile('./lz.min.js', 'eval(' + compressed + ')');
undefined
> require('lz.min.js');
[Function]
> // lz.js has now been minified, saved as lz.min.js, and is working :)
Files:
grammar.js
- version 1, grammar based compressionlz.js
- version 2, semi-lz77entry-*
compressed versions of abovebuild.js
node script that uses the module, and makes the entriesindex.html
shows the readme, and runs some of the entries in the browser